The start of autumn?

When autumn starts depends on where your interests lie. If it birds then it could be when the first non-breeding waders return on their passage south; for me it when the first of the typically autumn moth species starts to fly. The picture shows one of the most common species – the Lunar Underwing. The name refers to a feature that is not usually visible – a small dark cresent on the underwing.

Lunar Underwing, Cheltenham, 16 September 2012
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